BMW 132

BMW 132
Arnaud 25 · CC BY-SA 4.0 · source
Name	BMW 132
Type	Radial aircraft engine
Manufacturer	Bayerische Motoren Werke AG
First run	1930s
Status	Historic

BMW 132 The BMW 132 was a family of nine-cylinder, air-cooled radial aircraft engines developed and produced by Bayerische Motoren Werke AG during the interwar and World War II periods. It powered a wide range of German and exported transport and reconnaissance aircraft, influencing designs by manufacturers across Europe and shaping Luftwaffe logistics and civilian aviation in the 1930s and 1940s.

Development and design

Development began when Bayerische Motoren Werke AG sought to expand from licensed production toward indigenous radial engines to supply firms such as Deutsche Luft Hansa, Junkers, and Focke-Wulf. Early work referenced experiences from licensed production of Pratt & Whitney designs and lessons from BMW's inline engines for BMW-affiliated test pilots and engineers. Key figures in the process included BMW engineering staff collaborating with designers from Junkers, Heinkel, and Dornier to meet requirements set by Reichsluftfahrtministerium procurement plans and Deutsche Versuchsanstalt für Luftfahrt research. Design priorities reflected performance goals from Panzertruppen logistics planners and the needs of air transport companies like Deutsche Luft Hansa and Deutsche Zeppelin-Reederei for reliability across European routes and colonial services.

Technical description

The engine employed a nine-cylinder single-row radial configuration with aluminum alloy crankcase and steel cylinder barrels, using state-of-the-art metallurgy influenced by firms such as Krupp and Thyssen. Its valvetrain and carburization techniques followed advances paralleled at MAN and Siemens, while lubrication systems mirrored developments at Vereinigte Flugtechnische Werke. The supercharger design and mixture control benefited from research at Technische Hochschule Berlin and data shared by Luftwaffe test establishments. Cooling fins, ignition systems using magnetos similar to Bosch units, and carburators reflected integration of technologies used by Heinkel, Focke-Wulf, and Junkers on contemporary types like the Ju 52 and W 33. The BMW 132's modular accessory drives were compatible with avionics suites installed by Telefunken and Lorenz on transport and reconnaissance platforms.

Operational history

Operational use began with commercial operators such as Deutsche Luft Hansa on European and Mediterranean routes, and later extended to military service with the Luftwaffe on transport and maritime patrol aircraft. Notable operators included Deutsche Luft Hansa, Luftwaffe transport commands, and export clients in nations influenced by German aviation exports, including Romania, Hungary, and Bulgaria. The engine's service record intersected with operations involving the Condor Legion, Einsatzgruppen logistics, and Balkan campaigns, and it saw use in evacuation and supply flights during operations linked to the Battle of France and the Balkans Campaign. Maintenance doctrines drew on manuals from Junkers-Werke and training at Luftwaffe technical schools, while field repairs relied on spares produced by BMW, Siemens, Bosch, and MAN subcontractors.

Variants and specifications

Multiple variants provided different power ratings and gearings for specific airframes and missions. Series changes addressed altitude performance using supercharger gear ratios influenced by research at the Deutsche Versuchsanstalt für Luftfahrt and matched to airframes by Heinkel, Junkers, and Focke-Wulf. Variant distinctions were important for operators such as Deutsche Luft Hansa, Luftwaffe transport units, and foreign airlines in Romania and Spain. Performance figures and dimensional data were used by designers at Dornier, Arado, and Blohm & Voss when selecting powerplants for commercial and military designs. Engineers compared the BMW 132 family with contemporaries from Pratt & Whitney and Wright Aeronautical to benchmark reliability versus engines used by Pan American and British Overseas Airways Corporation.

Applications (aircraft)

The engine powered aircraft produced by manufacturers including Junkers, Focke-Wulf, Heinkel, Dornier, and Blohm & Voss; types included transports, reconnaissance aircraft, and maritime patrol platforms used by Deutsche Luft Hansa, Luftwaffe, and export airlines. Specific airframes associated with the engine family were integrated into fleets alongside types from Fairey, Armstrong Whitworth, and Short in export markets. Operational deployment placed BMW 132–powered aircraft in theaters and routes touching on the North Sea, Mediterranean, Balkans, and Eastern Front, often supporting operations coordinated with units and organizations such as the Wehrmacht logistics branches, Luftwaffe transport commands, and civil aviation authorities.

Production and legacy

Production was carried out by BMW with components subcontracted to firms such as Junkers Motorenwerke, MAN, and Siemens, supporting German industrial mobilization and export sales to countries including Romania, Hungary, and Bulgaria. The engine influenced postwar radial engine studies at institutions like Technische Hochschule Berlin and universities involved in engine reconstruction projects. Surviving examples are preserved in museums that document German aviation history, where curators reference archives from Deutsche Luft Hansa, Luftwaffe technical departments, and corporate records of BMW and associated suppliers. The BMW 132's role in commercial and military aviation contributed to broader narratives about 1930s aeronautical engineering, industrial policy, and multinational aviation networks involving companies and organizations such as Junkers, Heinkel, Focke-Wulf, Dornier, Deutsche Versuchsanstalt für Luftfahrt, and Telefunken.

Category:Aircraft engines